You can learn to read the wall. Those “growth rings” or “event lines” tell you that when the wall was being produced, a stress happened (metabolic or psychological).

It can be a change of livery, deworming, vaccines, spring grass, antibiotics, stressful event, etc. .
The more are present on the wall, the more issues there are. Keep an eye on it.

As the wall grows (from the coronary band down to the ground), the rings grow out. You can assess your “management success” by checking ou the news growth, and within a year, find a completely smooth wall!